Watch: ‘Lights Out’ Trailer Plays on Fear of the Dark

You were right to sleep with a nightlight, according to the first trailer for horror movie “Lights Out.”

Based on David F. Sandberg’s two-minute short film of the same name, which gained some viral fame in 2013, “Lights Out” follows Rebecca (Teresa Palmer) and her younger brother Martin (“Annabelle’s” Gabriel Bateman) as they’re tormented by a spirit that draws its power from darkness.

With every flicker of the light, the figure of a woman draws closer as its victims struggle to keep the light around to draw it away. After some investigating, the two find out that the poltergeist is tied to an event in their mother’s past, and feeds on fear.

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The trailer’s unique scares should be little surprise, given that James Wan, the director behind horror hits “The Conjuring” and “Insidious,” is one of the producers. Heisserer also produces, along with Lawrence Grey. Dave Neustadter, Walter Hamada, Michael Clear, Richard Brener, Ben Everard and Jack Murray executive produce.

The trailer debuted at New Line’s WonderCon panel on Saturday, along with a new trailer for Wan’s “The Conjuring 2.” “Lights Out” hits theaters July 22.

Nice to only have to wait until July to see it but why do horror movies not really come out in October the way they used to. Some do, but not the same type or same regularity. Now it’s a lot of awards bait films and action ones they know won’t do well in the summer or winter.